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3 1:2af 25 N acts on a body at rest for 12s and a force of 7U N acts for the nest 01s in opposie3 08 kg2-14 2:1e final velocity of the body is 5ms', tse mass of the body is22kg04kgie |
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Answer» let the mass be M. and initial velocity be 0 ,now acceleration for first 0.2sec is F1/M = 25/M so velocity after 0.2 is V = at = (25/M)*0.2 = 5/M now the acceleration changes to -70/Mand, Vfinal = -5m/s = 5/M -70/M(0.1) => -5 = 1/M*(5-7) => M = 2/5 kg = 0.4kg |
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